78006291 has 16 divisors (see below), whose sum is σ = 115160448. Its totient is φ = 46569600.

The previous prime is 78006283. The next prime is 78006311. The reversal of 78006291 is 19260087.

Added to its reverse (19260087) it gives a triangular number (97266378 = T₁₃₉₄₇).

It is not a de Polignac number, because 78006291 - 2³ = 78006283 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (78006241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15430 + ... + 19851.

It is an arithmetic number, because the mean of its divisors is an integer number (7197528).

Almost surely, 2^78006291 is an apocalyptic number.

78006291 is a deficient number, since it is larger than the sum of its proper divisors (37154157).

78006291 is a wasteful number, since it uses less digits than its factorization.

78006291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35362.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 78006291 is about 8832.1170168879. The cubic root of 78006291 is about 427.2773547395.

Adding to 78006291 its reverse (19260087), we get a triangular number (97266378 = T₁₃₉₄₇).

The spelling of 78006291 in words is "seventy-eight million, six thousand, two hundred ninety-one".